The present invention provides a protected nucleotide for elongation, which can be purified efficiently and in a high yield by a liquid-liquid extraction operation, and can achieve an oligonucleotide production method by a phosphoramidite method.
It has been found that the above-mentioned problem can be solved by a particular oligonucleotide comprising a protected base and/or particular oligonucleotide protected by a branched chain-containing aromatic group at 3′-position.
本发明提供了一种用于延长的受保护核苷酸,可以通过液-液萃取操作高效且高产地纯化,并且可以通过
磷酰胺酯法实现寡核苷酸的生产方法。已发现上述问题可以通过包含受保护碱基和/或在3'-位置带有分支链含芳基的特定寡核苷酸来解决。